the mean of 11 observation is 50 if the mean of first 6 observation is 49 and that of last 6 observations is 52 then the 6 observation is
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Mean of 11 obs = 50
Sum total = 11*50 = 550
Mean of first 6 = 49
Sum total = 6*49 = 294
Mean of last 6 = 52
Sum total = 6*52 = 312
Value of 6th obs = (294 + 312) - 550 = 56
OR
50+ (-1*6) + (2*6) = 50 + 6 = 56 [Change in average concept]
Sum total = 11*50 = 550
Mean of first 6 = 49
Sum total = 6*49 = 294
Mean of last 6 = 52
Sum total = 6*52 = 312
Value of 6th obs = (294 + 312) - 550 = 56
OR
50+ (-1*6) + (2*6) = 50 + 6 = 56 [Change in average concept]
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